Compensation for primary reflector wavefront error

Details Compensation for primary reflector wavefront error Compensation for primary reflector wavefront error

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nasa.repts....m&link_type=abstract

Patent Application National Aeronautics and Space Administration. Pasadena Office, CA.

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Applications

Compensators, Errors, Instrument Compensation, Mirrors, Reflectors, Telescopes, Focusing, Patent Applications

Scientific paper

The object of the invention is to compensate for errors in a large telescope primary reflector by making certain compensating deviations in a smaller, auxiliary reflector of the telescope. At least one intermediate element forms an image of the primary surface onto the secondary surface, so each point on the secondary surface corresponds to a point on the primary surface. The secondary surface is formed with a deviation from an ideal secondary surface, with the piston distance of each point on the actual secondary surface equal to the piston distance of a corresponding piston on the actual primary surface from the ideal primary surface. It is found that this results in electromagnetic (e.g., light) rays which strike a deviating area of the actual primary surface being brought to the same focus as if the actual primary surface did not have a diviation from an ideal primary surface.

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